/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.engineconnplugin.flink.client.sql.operation.impl;

import org.apache.linkis.engineconnplugin.flink.client.context.ExecutionContext;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.NonJobOperation;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.OperationUtil;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.result.ResultSet;
import org.apache.linkis.engineconnplugin.flink.context.FlinkEngineConnContext;
import org.apache.linkis.engineconnplugin.flink.exception.SqlExecutionException;

/** Operation for RESET command. */
public class ResetOperation implements NonJobOperation {
    private final FlinkEngineConnContext context;

    public ResetOperation(FlinkEngineConnContext context) {
        this.context = context;
    }

    @Override
    public ResultSet execute() throws SqlExecutionException {
        ExecutionContext executionContext = context.getExecutionContext();
        // Renew the ExecutionContext by merging the default environment with original session
        // context.
        // Book keep all the session states of current ExecutionContext then
        // re-register them into the new one.
        ExecutionContext.Builder builder =
                context.newExecutionContextBuilder(context.getEnvironmentContext().getDefaultEnv())
                        .sessionState(executionContext.getSessionState());
        context.setExecutionContext(executionContext.cloneExecutionContext(builder));

        return OperationUtil.OK;
    }
}
